Reviews by patients who have Tooth Pain and take Zinc either as part of daily diet or as method of treatment. Positive and negative experiences from patients with Tooth Pain that take Zinc
1 Red or black colored stool may be a sign of bleeding in the GI tract (from the esophagus, stomach, small intestine or colon) and should not be ignored.  When stool color changes, what tests need to be done depend upon depends upon what cause is suspected for the stool color change.
According to Wikipedia, a gastrointestinal hemorrhage causes the stool to appear black because of â. . . oxidation of the iron in hemoglobin during its passage through the ileum and colon.â Black stool differs from bloody stool even though both conditions stem from internal bleeding.